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www.bendix.com 1-800-AIR-BRAKE (1-800-247-2725)
Miscellaneous Charging System Related Components
A double check valve is used in the air system when
a single function or component must receive air from,
or be controlled by, the higher of two sources of
pressure. An internal disc or shuttle moves in response
to the higher air pressure and allows that air source to
flow out of the delivery port. It is recommended that
double check valves be mounted so that the shuttle
(or disc) operates horizontally.
While not strictly part of the charging system, the
DS-2
™
double check valve and stop light switch
(shown on this page) performs the function of both a
stop lamp switch and a double check valve. In some
vehicle brake systems, it is used to detect air pressure
from either brake circuit source, and will operate the
stop lamp switch, lighting the stop lamps.
Auxiliary Systems
Vehicle auxiliary components and systems (air actuated
wipers, suspension, etc.) requiring compressed air must
wait until the reservoirs in the charging system have
reached a predefined minimum pressure, sufficient for
braking purposes. Once the system has reached the
preset minimum, pressure protection valves open to
supply auxiliary systems.
Pressure Protection Valves
The pressure protection valve is a normally-closed
pressure sensitive control valve. These valves can be
used in many different applications but are typically used
to protect or isolate one reservoir from another, by
closing automatically at a preset pressure. The valve is
also commonly used to delay the filling of auxiliary
reservoirs until a preset pressure is achieved in the
primary or braking reservoirs. Pressure protection
valves allow air to be "shared" between two reservoirs
above the closing setting of the valve. The sharing
ceases when pressure drops below the closing pressure
of the valve and the reservoirs are then isolated from
each other.
The PR-2
™
pressure protection valve is externally
adjustable, while the PR-4
™
pressure protection
valve (shown) has a fixed setting. Both valves are
available in various factory preset pressure settings. The
PR-3
™
pressure protection valve differs from the
two previously mentioned since its design includes a
check valve preventing air return.
Pressure Reducing Valves
The pressure reducing valve is used in various
applications where a constant set air pressure lower
than supply pressure is required. A typical application
is an air operated accessory that requires less than
system pressure for operation. The RV-1
™
pressure
DC-4
™
Double
Check
Valve
RV-1
™
Pressure
Reducing
Valve
DS-2
™
Double Check
and Stop Light
Switch
reducing valve (shown) is available in a wide range of
pressure settings and can be manually adjusted. The
RV-3
™
pressure reducing valve is available with
factory preset pressure settings only and cannot be
manually adjusted.
Pressure
Protection
Valve
Auxiliary
PR-4
™
Pressure
Protection
Valve
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